...other than "feeling" DSC/MDM interaction to the car, just how are you noticing the red light? I admit I wasn't looking closely when I wasn on the track, and I guess I forget to look when I'm driving on the street. It never blinks on the instrument panel, just the Hazard light triangle, correct?

I am relying on the hazard triangle to come on. MDM does not blink. Since I was deliberately doing an experiment on tracks I am very comfortable with, I was paying attention to the light. Peripheral vision can pick it up easily.